Dimethyl meso-3,3-Dimethylcyclopropane-1,2-dicarboxylate

dimethyl 5,5-dimethylpyrazole-3,4-dicarboxylate

1,2,3,4-tetraphenylbenzene

tetramethyl 1,2,3,4,5,6,7,8-octahydro-1,4:5,8-diepoxyanthracene-2,3,6,7-tetracarboxylate

dimethyl 2-phenyl-1H-pyrrole-3,4-dicarboxylate